Peters



(No Model.) 4 Sheets-Sheet 1.

J. GATES.

DIRECT ACTING STEAM PUMP.

Patented July 25, 1882.

clcclcdnn ATTORNEYS.

r4. PETERS. Hmlwl-nhognpher. Wnhllgtan. n. c.

(No Model.) 4 Sheets-Sheet 2.

. J. GATES. S

r DIREGT "AGTINGSTEAM PUMP. E No. 261,700. Pag t July 25, 18-82.

WITNESSES INVENTOR j 696547 /6 7 BY ATTORNEYS.

N. PETERS. vhmwumgnpmn WnMnglon. ac.

(No Model.) 4 Sheets-Sheet a. J. GATES.

DIREGT AUTING STEAM PUMP. No. 261,700. Patented July 25, 1882.

WITNESSES INVENTOR Jzywgwf I BY MM 0 3 ATTORNEYS.

N. Ptrzns Pbalo-Lilhagnphur, Walhington. n c.

(No Model.) 4 Sheets-Sheet 4.

J. GATES.

DIBEGT ACTING STEAM PUMP. No. 261,700. Patented July 25, 1882.

INVBNTOR:

ATTORNEYS.

' WITNESSES:

N. PETERS, Plwb-Lilhngnphor. Walhinliom 0.6.

. UNITED STATES PATENT OFFICE.

JOHN GATES, OF PORTLAND, OREGON.

DI RECT-ACTING .STEAM-PUM P.

SPECIFICATION forming part of Letters Patent No. 261,700, dated July 25,1882.

' Application filed April 14, 1882. (No model.)

To all whom it may concern:

Beit known that I, JOHN GATES, of Portland, in the county of Multnomahand State of Oregon, have invented a new and useful Improvement inDirect-Acting Steam-Pumps, of which the followingis a full, clear, andexact description.

My invention relates to the mechanism for shifting the valves indirect-acting engines; and it consists in the novel devices hereinafterdescribed and claimed.

Reference is to be had to the accompanying drawings, forming part ofthis specification, in which similar letters of reference indicatecorresponding parts in all the figures.

Figure l is a vertical longitudinal section of a direct-acting engineprovided with my improved valve mechanism. Fig. 2 is a crosssection, andFig. 3 a side view, of a modification in which a plate-spring issubstituted for a spiral. Figs. 4 and 5 are sectional elevations,showing modifications in the arrangement of the gearing. Fig. 6 is across-section on line a; as of Fig. 4, and Figs. 7 and 8 show themechanism as applied in connection with a rotary valve. Fig. 9 is adetail View of the shuttlebar-carrying arm, and Fig. 10 is a detail viewof the shuttle-bar-carryin g arm when the mechanism is applied to arotary valve.

Referring first to Fig. 1, A is the steam-cylinder;B,thesteam-chestcontainingslide-valve a. O is the pump-cylinder. b isthe piston-rod, and c c are side bars connecting the two cylinders. ddare steel bars pivoted on cross-pins between the said bars 0, andconnected at their lower ends by a rod, f, on which are collars g g,held by set-screws, so that thecollars can be adjusted. his a bar, whichI term the shuttlebar, connecting the upper ends of bars d, and formednear its ends with beveled shoulders h. In connecting the rod f and barIt they are to be fitted tightly, so as to take up all slack, and thebars 01 thereby given spring enough to strain the connections. 0n theend of the valve-stem a, is screwed a block, a that is formed withtrunnions on its sides for receivin g the ends of the links a, by whichthe valve stem is connected tothe shuttle-bar. (See Fig. 9.) Thecheck-nut c on the valve-stem is enlarged to take against the ends ofthe links, so as to take up the slack caused by wear, and at the sametime to hold the valve stem as adjusted. In case the valve is one-sidedthe check nut will be loosened and the stem turned until the valve isevened, which may be done while the pump is running. i is a standardrising from cross-head i on pistonrod 1), slotted at b forthe collar-barf to pass, and forked to extend at sides of the side bars, 0. On itsupper end the standard 2' supports a hollow post, 76, in which is a rod,1, that carries at its lower end a dog, m, resting on shuttlebar h. Therod I has upon it within the post a spiral spring, 70, that tends toforce the dog at upon the shuttle-bar with more or less pressure, whichis regulated by a follower-screw, m, in the upper end of post It. Thedownward movement of rod 1 is limited by a set-nut, O, on the rod, abovethe screw m, a lblock, 7L2, of rubber, being interposed between the headand nut to preventrattling; ora spiral spring may be used in place ofthe block. The standard i takes by a bearing-block, a, beneath the underside of side bars, 0, to prevent strain on the piston-rod by the spring70. Upon each side of the dog m, Fig. 1, plates m are attached by boltsthat pass through the dog. These plates lap upon the standard t andserve to hold the dog against the side pressure when it is moving theshuttle-bar, and they can be set up to compensate for wear.

The operation of these devices is as follows: Supposing the piston tomove toward either end of i the cylinder from the middle positionshown,the shuttle-bar would be in the position of the dotted lines andthe dog at in its lowest position, either resting on the shuttle-bar orheld clear of the bar, according to adjustment of the nut 0. Now,suppose the shuttle to be at the left-hand position and the pistonmoving to the left, the standard i comes in contact with collar 9 on therod f, and the further movement of the piston brings the bars d d to avertical position and the shuttle bar up against the dog m, therebysetting the spring is and nearly closing the slide-valve by the time thedog reaches the cycloidal bevel at the end of'the shuttle-bar. Then theforce of the spring, acting by the dog on the bevel, moves theshuttle-bar to the right, at first solely by the bevel, and after thebars d have passed the center finishing the movement by downwardpressure, so that the valve admits steam to the other end of thecylinder, or, in other words, the valve is reversed. It will be evidentthat this throw of the valve can be made more or less by adjustment ofthe dog by means of the screw m and nut c. The completion of the openingof the valve is accomplished when the piston, by its reverse movement,carries the dog at against the bevel of the shuttle-bar. To prevent thevalve from going too far, the piston-rod comes in contact with the topof the slot in standard 71, where a rubber buffer is provided to easethe shock. By adjustment of the connection between the shuttle-bar andvalve-stem the upright bars d are made to pass the center sooner orlater with reference to the contact of the dog with the bevel, and thethrow thus varied.

The advantage of these devices is that the working parts are all insight and readily accessible for keeping in order. There is a furtheradvantage that the movements are noiseless. The bevels on theshuttle-bar are of cycloidal form, so that the dog takes first on thecurved portion, and the bevel then becoming flat, the force of thespring is brought to rest easily.

' The modification shown in Figs. 2 and 3 relaies to the form of springused to force the dog m downward. The upper end of standard t is formedto receive a plate or how spring, 19, that carries rod 1 and dog m. Thespring 9 is provided with a counter-spring, 1 on its upper side, abovewhich is a large adj ustingnut, 70 and between the two springs the rod Zis provided with a set-nut.

In the construction shown in Figs. 4, 5, and 6 the parts are essentiallythe same, and the arrangement modified as follows: The side bars, 0, arecurved upward, and carry a rockshaft, q, that has an arm, q, connectingto stem a of valve to. The collar-bar f .is sustained by a fixedguide,f, at one end, and at the other end connects to a pivoted bar, 61,to which the outer end of stem aisjointed. The shouldered bar It isattached to the piston-rod b by an arm, h for reciprocation therewith,and the rock-shaft q sustains the tubular post 70, in which is the rod1, attached by a spring,

70, and carrying at its lower end the dog m for contact with bar h. Fig.4 shows the parts in the middle position, while Fig. 5 shows the pistonat its extreme of movement, when the valve has been moved by the dog onhaving slipped off the beveled end of bar h.

In Figs. 7 and 8 the mechanism is shown as applied in connection with arotary valve. B is the valve-case on cylinder A. a is the valvestem,carrying at its outer end the post 70, of construction as shown in Fig.6. his the shuttle-bar, carried at one side by an arm, F, on thepiston-rod, and supported beneath the dog at by a fixed guide, 7'. f isthe collar-bar, connected to one end of a pivoted rock-bar, d, andengaged by arm 4?. s is a rod connecting the rock-bar d to the post 70.In operation the dog on is released from bar h by the upward swing ofpost 70.

This mechanism is simple and effects the movement of the slide-valvewithout the use of piston-valves.

Having thus fully described my invention, what I claim as new, anddesire to secure by Letters Patent, is

1. In direct-acting engines, the combination of pivoted rock-bars d,collar-bar f, shuttle-bar h, connected to the valve-stem, and spring-dogm, carried by the piston-rod, substantially as described, for operationas specified.

2. The combination, with the valve-stem a, the pivoted bar (1, the fixedguide I), and collar-bar f, of the shuttle-bar h, connected to thevalve-stemby link a, the tubular post k, the spring-actuated rod 1, andthe dog m, substantially as and for the purpose set forth.

3. The combination of check-nut c collar a links a, and valve-stem a,substantially as described.

4. In direct-acting engines, the standards 6, post 70, spring rod 1, dogm, shuttle-bar It, and side bars, a, substantially as described,combined for operation as set forth.

JOHN GATES.

Witnesses:

EUGENE D. WHITE, E. W. CORNELL.

